class DQNode{
    DQNode prev;     //上一个结点
    DQNode next;     //下一个节点
    int value;

    public DQNode( DQNode prev,  DQNode next, int value) {
        this.prev = prev;
        this.next = next;
        this.value = value;
    }
}


class DoubleQmyList{
    DQNode sentinel = new DQNode(null,null,-1);; //哨兵

    public DoubleQmyList() {
        sentinel.prev = sentinel;
        sentinel.next = sentinel;

    }
}

public class DoubleQList {
    //带头结点的双向链表
    public static void main(String[] args) {

    }
}
